That's a good idea. What I do usually is to start default with a connection to an external 4G hotspot dongle. If that's unavailable, it's own hotspot is created. Feom there, I can connect and select any other available network.
My home wifi doesn't reach the garden that well, so I just plug in an ethernet cable.That's -much better- in any case. Using a flat Cat 5e cable, it fits through the doorsil and the door, no problem.
Cheers!